![Christian König](/assets/img/avatar_default.png)
Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com> Reviewed-by: Monk Liu <monk.liu@amd.com>
323 lines
7.8 KiB
C
323 lines
7.8 KiB
C
/*
|
|
* Copyright 2014 Advanced Micro Devices, Inc.
|
|
* All Rights Reserved.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sub license, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
|
|
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
|
|
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
|
|
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
|
|
* USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*
|
|
* The above copyright notice and this permission notice (including the
|
|
* next paragraph) shall be included in all copies or substantial portions
|
|
* of the Software.
|
|
*
|
|
*/
|
|
/*
|
|
* Authors:
|
|
* Christian König <christian.koenig@amd.com>
|
|
*/
|
|
|
|
#include <linux/firmware.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mmu_notifier.h>
|
|
#include <drm/drmP.h>
|
|
#include <drm/drm.h>
|
|
|
|
#include "amdgpu.h"
|
|
|
|
struct amdgpu_mn {
|
|
/* constant after initialisation */
|
|
struct amdgpu_device *adev;
|
|
struct mm_struct *mm;
|
|
struct mmu_notifier mn;
|
|
|
|
/* only used on destruction */
|
|
struct work_struct work;
|
|
|
|
/* protected by adev->mn_lock */
|
|
struct hlist_node node;
|
|
|
|
/* objects protected by lock */
|
|
struct mutex lock;
|
|
struct rb_root objects;
|
|
};
|
|
|
|
struct amdgpu_mn_node {
|
|
struct interval_tree_node it;
|
|
struct list_head bos;
|
|
};
|
|
|
|
/**
|
|
* amdgpu_mn_destroy - destroy the rmn
|
|
*
|
|
* @work: previously sheduled work item
|
|
*
|
|
* Lazy destroys the notifier from a work item
|
|
*/
|
|
static void amdgpu_mn_destroy(struct work_struct *work)
|
|
{
|
|
struct amdgpu_mn *rmn = container_of(work, struct amdgpu_mn, work);
|
|
struct amdgpu_device *adev = rmn->adev;
|
|
struct amdgpu_mn_node *node, *next_node;
|
|
struct amdgpu_bo *bo, *next_bo;
|
|
|
|
mutex_lock(&adev->mn_lock);
|
|
mutex_lock(&rmn->lock);
|
|
hash_del(&rmn->node);
|
|
rbtree_postorder_for_each_entry_safe(node, next_node, &rmn->objects,
|
|
it.rb) {
|
|
|
|
interval_tree_remove(&node->it, &rmn->objects);
|
|
list_for_each_entry_safe(bo, next_bo, &node->bos, mn_list) {
|
|
bo->mn = NULL;
|
|
list_del_init(&bo->mn_list);
|
|
}
|
|
kfree(node);
|
|
}
|
|
mutex_unlock(&rmn->lock);
|
|
mutex_unlock(&adev->mn_lock);
|
|
mmu_notifier_unregister(&rmn->mn, rmn->mm);
|
|
kfree(rmn);
|
|
}
|
|
|
|
/**
|
|
* amdgpu_mn_release - callback to notify about mm destruction
|
|
*
|
|
* @mn: our notifier
|
|
* @mn: the mm this callback is about
|
|
*
|
|
* Shedule a work item to lazy destroy our notifier.
|
|
*/
|
|
static void amdgpu_mn_release(struct mmu_notifier *mn,
|
|
struct mm_struct *mm)
|
|
{
|
|
struct amdgpu_mn *rmn = container_of(mn, struct amdgpu_mn, mn);
|
|
INIT_WORK(&rmn->work, amdgpu_mn_destroy);
|
|
schedule_work(&rmn->work);
|
|
}
|
|
|
|
/**
|
|
* amdgpu_mn_invalidate_range_start - callback to notify about mm change
|
|
*
|
|
* @mn: our notifier
|
|
* @mn: the mm this callback is about
|
|
* @start: start of updated range
|
|
* @end: end of updated range
|
|
*
|
|
* We block for all BOs between start and end to be idle and
|
|
* unmap them by move them into system domain again.
|
|
*/
|
|
static void amdgpu_mn_invalidate_range_start(struct mmu_notifier *mn,
|
|
struct mm_struct *mm,
|
|
unsigned long start,
|
|
unsigned long end)
|
|
{
|
|
struct amdgpu_mn *rmn = container_of(mn, struct amdgpu_mn, mn);
|
|
struct interval_tree_node *it;
|
|
|
|
/* notification is exclusive, but interval is inclusive */
|
|
end -= 1;
|
|
|
|
mutex_lock(&rmn->lock);
|
|
|
|
it = interval_tree_iter_first(&rmn->objects, start, end);
|
|
while (it) {
|
|
struct amdgpu_mn_node *node;
|
|
struct amdgpu_bo *bo;
|
|
long r;
|
|
|
|
node = container_of(it, struct amdgpu_mn_node, it);
|
|
it = interval_tree_iter_next(it, start, end);
|
|
|
|
list_for_each_entry(bo, &node->bos, mn_list) {
|
|
|
|
if (!bo->tbo.ttm || bo->tbo.ttm->state != tt_bound)
|
|
continue;
|
|
|
|
r = amdgpu_bo_reserve(bo, true);
|
|
if (r) {
|
|
DRM_ERROR("(%ld) failed to reserve user bo\n", r);
|
|
continue;
|
|
}
|
|
|
|
r = reservation_object_wait_timeout_rcu(bo->tbo.resv,
|
|
true, false, MAX_SCHEDULE_TIMEOUT);
|
|
if (r <= 0)
|
|
DRM_ERROR("(%ld) failed to wait for user bo\n", r);
|
|
|
|
amdgpu_ttm_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_CPU);
|
|
r = ttm_bo_validate(&bo->tbo, &bo->placement, false, false);
|
|
if (r)
|
|
DRM_ERROR("(%ld) failed to validate user bo\n", r);
|
|
|
|
amdgpu_bo_unreserve(bo);
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&rmn->lock);
|
|
}
|
|
|
|
static const struct mmu_notifier_ops amdgpu_mn_ops = {
|
|
.release = amdgpu_mn_release,
|
|
.invalidate_range_start = amdgpu_mn_invalidate_range_start,
|
|
};
|
|
|
|
/**
|
|
* amdgpu_mn_get - create notifier context
|
|
*
|
|
* @adev: amdgpu device pointer
|
|
*
|
|
* Creates a notifier context for current->mm.
|
|
*/
|
|
static struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev)
|
|
{
|
|
struct mm_struct *mm = current->mm;
|
|
struct amdgpu_mn *rmn;
|
|
int r;
|
|
|
|
down_write(&mm->mmap_sem);
|
|
mutex_lock(&adev->mn_lock);
|
|
|
|
hash_for_each_possible(adev->mn_hash, rmn, node, (unsigned long)mm)
|
|
if (rmn->mm == mm)
|
|
goto release_locks;
|
|
|
|
rmn = kzalloc(sizeof(*rmn), GFP_KERNEL);
|
|
if (!rmn) {
|
|
rmn = ERR_PTR(-ENOMEM);
|
|
goto release_locks;
|
|
}
|
|
|
|
rmn->adev = adev;
|
|
rmn->mm = mm;
|
|
rmn->mn.ops = &amdgpu_mn_ops;
|
|
mutex_init(&rmn->lock);
|
|
rmn->objects = RB_ROOT;
|
|
|
|
r = __mmu_notifier_register(&rmn->mn, mm);
|
|
if (r)
|
|
goto free_rmn;
|
|
|
|
hash_add(adev->mn_hash, &rmn->node, (unsigned long)mm);
|
|
|
|
release_locks:
|
|
mutex_unlock(&adev->mn_lock);
|
|
up_write(&mm->mmap_sem);
|
|
|
|
return rmn;
|
|
|
|
free_rmn:
|
|
mutex_unlock(&adev->mn_lock);
|
|
up_write(&mm->mmap_sem);
|
|
kfree(rmn);
|
|
|
|
return ERR_PTR(r);
|
|
}
|
|
|
|
/**
|
|
* amdgpu_mn_register - register a BO for notifier updates
|
|
*
|
|
* @bo: amdgpu buffer object
|
|
* @addr: userptr addr we should monitor
|
|
*
|
|
* Registers an MMU notifier for the given BO at the specified address.
|
|
* Returns 0 on success, -ERRNO if anything goes wrong.
|
|
*/
|
|
int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
|
|
{
|
|
unsigned long end = addr + amdgpu_bo_size(bo) - 1;
|
|
struct amdgpu_device *adev = bo->adev;
|
|
struct amdgpu_mn *rmn;
|
|
struct amdgpu_mn_node *node = NULL;
|
|
struct list_head bos;
|
|
struct interval_tree_node *it;
|
|
|
|
rmn = amdgpu_mn_get(adev);
|
|
if (IS_ERR(rmn))
|
|
return PTR_ERR(rmn);
|
|
|
|
INIT_LIST_HEAD(&bos);
|
|
|
|
mutex_lock(&rmn->lock);
|
|
|
|
while ((it = interval_tree_iter_first(&rmn->objects, addr, end))) {
|
|
kfree(node);
|
|
node = container_of(it, struct amdgpu_mn_node, it);
|
|
interval_tree_remove(&node->it, &rmn->objects);
|
|
addr = min(it->start, addr);
|
|
end = max(it->last, end);
|
|
list_splice(&node->bos, &bos);
|
|
}
|
|
|
|
if (!node) {
|
|
node = kmalloc(sizeof(struct amdgpu_mn_node), GFP_KERNEL);
|
|
if (!node) {
|
|
mutex_unlock(&rmn->lock);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
bo->mn = rmn;
|
|
|
|
node->it.start = addr;
|
|
node->it.last = end;
|
|
INIT_LIST_HEAD(&node->bos);
|
|
list_splice(&bos, &node->bos);
|
|
list_add(&bo->mn_list, &node->bos);
|
|
|
|
interval_tree_insert(&node->it, &rmn->objects);
|
|
|
|
mutex_unlock(&rmn->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* amdgpu_mn_unregister - unregister a BO for notifier updates
|
|
*
|
|
* @bo: amdgpu buffer object
|
|
*
|
|
* Remove any registration of MMU notifier updates from the buffer object.
|
|
*/
|
|
void amdgpu_mn_unregister(struct amdgpu_bo *bo)
|
|
{
|
|
struct amdgpu_device *adev = bo->adev;
|
|
struct amdgpu_mn *rmn;
|
|
struct list_head *head;
|
|
|
|
mutex_lock(&adev->mn_lock);
|
|
rmn = bo->mn;
|
|
if (rmn == NULL) {
|
|
mutex_unlock(&adev->mn_lock);
|
|
return;
|
|
}
|
|
|
|
mutex_lock(&rmn->lock);
|
|
/* save the next list entry for later */
|
|
head = bo->mn_list.next;
|
|
|
|
bo->mn = NULL;
|
|
list_del(&bo->mn_list);
|
|
|
|
if (list_empty(head)) {
|
|
struct amdgpu_mn_node *node;
|
|
node = container_of(head, struct amdgpu_mn_node, bos);
|
|
interval_tree_remove(&node->it, &rmn->objects);
|
|
kfree(node);
|
|
}
|
|
|
|
mutex_unlock(&rmn->lock);
|
|
mutex_unlock(&adev->mn_lock);
|
|
}
|